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The ATLASPix3.1 CMOS Pixel Sensor Testbeam Performance and Serial Powering Characterisation
No full textHigh-voltage CMOS (HV-CMOS) pixel technology is being considered for future Higgs factory experiments. The ATLASPix3.1 chip, with a pitch of 50 μm × 150 μm, fabricated using TSI 180 nm HV-CMOS technology, is a full reticle-size monolithic HV-CMOS sensor with shunt-low dropout (LDO) regulators that allow serial powering for multiple sensors. A beam test was conducted at DESY using 3–6 GeV electron beams, with chips operated in triggerless readout mode with zero suppression, demonstrating multi-chip capability. This was further evaluated with hadron beams, both with and without the built-in power regulators. This study presents the electrical characterisations of the shunt-LDO regulators for serial powering and test beam results of ATLASPix3.1 sensors.High-voltage CMOS (HV-CMOS) pixel technology is being considered for future Higgs factory experiments. The ATLASPix3.1 chip, with a pitch of 50 x 150, fabricated using TSI 180nm HV-CMOS technology, is a full reticle-size monolithic HV-CMOS sensor with shunt-low dropout (LDO) regulators that allow serial powering for multiple sensors. A beam test was conducted at DESY using 3-6 GeV electron beams, with chips operated in triggerless readout mode with zero suppression, demonstrating multi-chip capability. This was further evaluated with hadron beams, both with and without the built-in power regulators. This study presents the electrical characterisations of the shunt-LDO regulators for serial powering and test beam results of ATLASPix3.1 sensors
PUMA, SPSC report on activities of 2024
No full textThe PUMA experiment was accepted at CERN in 2021. PUMA is in its construction phase. This document summarises the work performed in 2024. The present report focuses on the latest phases of the construction and installation of the experiment at the Antimatter Factory, and the preparation of the rare-isotope beam line at ISOLDE dedicated to PUMA
Report from the LHC Experiments’ Young Scientist Fora
No full textThe LHC Early Career Scientist Fora (LHC ECSF) comprises the ALICE Junior Representatives, ATLAS Early Career Scientist Board (ATLAS ECSB), the CMS Young Scientists Committee (CMS YSC) and the LHCb Early Career, Gender and Diversity Office (LHCb ECGD). It aims to represent and meet the professional needs of early career researchers working on the four main LHC experiments. Its members act as contact persons for early career researchers in order to address issues affecting the early career researcher community, organise events and initiatives, and provide representation in experimental Collaboration or Management Boards. This conference proceeding provides an update about the ECSF’s activities and upcoming plans
Traditional New Year's Reception Ceremony hosted by CERN's Director General, Fabiola Gianotti
No full textRepresentatives of CERN’s local communities and international Geneva came together in hall SMI8 for a traditional annual event hosted by the CERN's Director General, Fabiola Gianotti. The Director General meets representatives of CERN’s local communities and international Geneva to wish them a Happy New Year and to express thanks for their support. This ceremony continues a long-standing tradition, reflecting CERN’s important position in the Geneva region. The event also offers an opportunity for local representatives from both sides of the border to meet members of Geneva’s international community, and it is an occasion for CERN to nourish the relationship it enjoys with its host region
Exploring the performance of a DOI-capable TOF-PET module using different SiPMs, customized and commercial readout electronics
No full textObjective. Time resolution is crucial in positron emission tomography (PET) to enhance the signal-to-noise ratio and image quality. Moreover, high sensitivity requires long scintillators, which can cause distortions in the reconstructed images due to parallax effects. This study evaluates the performance of a time-of-flight (TOF)-PET module that makes use of a single-side readout of a mm LYSO:Ce matrix with an array of silicon photomultipliers (SiPMs) and a light guide to extract high-resolution TOF and depth of interaction (DOI) information. Approach. This study assesses the performance of the detector prototype using the commercially available TOFPET2 ASIC and SiPMs from various producers. DOI and TOF performance are compared to results using custom-made NINO 32-chip based electronics. Main results. Using a Broadcom NUV-MT array, the detector module read out by the TOFPET2 ASIC demonstrates a DOI resolution of 2.6 ± 0.2 mm full width at half maximum (FWHM) and a coincidence time resolution (CTR) of 216 ± 6 ps FWHM. When read out using the NINO 32-chip based electronics, the same module achieves a DOI resolution of 2.5 ± 0.2 mm and a CTR of 170 ± 5 ps. Significance. The prototype module, read out by commercial electronics and using state-of-the-art SiPMs, achieves a DOI performance comparable to that obtained with custom-made electronics and a CTR of around 200 ps. This approach is scalable to thousands of channels, with only a deterioration in timing resolution compared to the custom-made electronics, which achieve a CTR of 140 ps using a standard non-DOI module
Combination of searches for resonant Higgs boson pair production using collisions at = 13 TeV with the ATLAS detector
No full textCombination of searches for the resonant production of Higgs boson pairs is performed in the , , and decay channels using up to 139~fb of proton-proton collision data at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the LHC. No significant excess over the expected background was observed, and upper limits were set at the 95\% confidence level on the production cross section of Higgs boson pairs from the decay of a narrow scalar resonance with masses ranging from 251 GeV to 5 TeV. The observed (expected) upper limits range from 0.96 to 600 fb (1.2 to 390 fb). These results are interpreted in the context of the Type-I Two-Higgs-Doublet Model (2HDM) and the Minimal Supersymmetric Standard Model (MSSM), tightening constraints on parameter spaces not previously excluded by other searches
Analytical and Numerical Study of Superconducting Dipole and Quadrupole Performance Limits for a Muon Collider
No full textIn accordance with the guidelines set forth in the Updated European Strategy for Particle Physics, the International Muon Collider Collaboration has been initiated to assess the feasibility of a Muon Collider facility with a center-of-mass energy of 10 TeV. The primary challenges stem from the brief muon lifetime at rest, which is limited to 2.2 µs. Addressing this demanding condition necessitates the incorporation of advanced technologies in magnets, RF systems, targets, shielding, and cooling. To minimize collimated neutrino beams resulting from muon decay and reduce the impact of radiation background around the facility, the straight sections in the collider ring must be minimized. Achieving this goal involves integrating beam optics quadrupoles with bending dipoles featuring a high magnetic field (10 T) and gradient (100 T/m) within a large aperture (140 mm). These stringent constraints require cutting-edge technologies in material selection, mechanical layout, quench protection, shielding, and cooling. This contribution explores the performance limits of potential candidate materials for such magnets, specifically LTS (Low-Temperature Superconductors) NbSn and (High-Temperature Superconductors) ReBCO, regarding the maximum field, mechanical stress, and stored energy. We present an original approach that allows us to explore the achievable phase space of parameters using both analytical expressions and the FEM software ANSYS, handled by Python code. Using this approach, we will show the obtained results for dipoles and quadrupoles
Advancing ATLAS DCS Data Analysis with a Modern Data Platform
No full textThis paper presents a modern and scalable framework for analyzing Detector Control System (DCS) data from the ATLAS experiment at CERN. The DCS data, stored in an Oracle database via the WinCC OA system, is optimized for transactional operations, posing challenges for large-scale analysis across extensive time periods and devices. To address these limitations, we developed a data pipeline using Apache Spark, CERN's Hadoop service, and the CERN SWAN platform. This framework integrates seamlessly with Python notebooks, providing an accessible and efficient environment for data analysis using industry-standard tools. The approach has proven effective in troubleshooting Data Acquisition (DAQ) links for the ATLAS New Small Wheel (NSW) detector, demonstrating the value of modern data platforms in enabling detector experts to quickly identify and resolve critical issues